# QBLP650-R Electronic Specifications and Overview The **QBLP650-R** is a high-brightness Surface Mount Device (SMD) LED manufactured by **QT-Brightek**. It belongs to the 1206 package size category and is widely used for status indication, backlighting, and consumer electronics. --- ## 1. Key Technical Specifications The following table summarizes the core electronic and optical characteristics of the QBLP650-R (Red): | Parameter | Symbol | Value (Typical) | Unit | | :--- | :--- | :--- | :--- | | **Color** | - | Red | - | | **Dominant Wavelength** | $\lambda_D$ | 620 - 630 | nm | | **Forward Voltage** | $V_F$ | 2.0 (Max 2.5) | V | | **Forward Current** | $I_F$ | 20 | mA | | **Luminous Intensity** | $I_V$ | 80 - 150 | mcd | | **Viewing Angle** | $2\theta_{1/2}$ | 140 | Degrees | | **Reverse Voltage** | $V_R$ | 5 | V | --- ## 2. Electrical Characteristics & Behavior ### A. Forward Voltage ($V_F$) The device typically operates at **2.0V**. When designing a circuit, a current-limiting resistor is mandatory to prevent thermal runaway. * **Formula for Resistor ($R$):** $R = (V_{source} - V_F) / I_F$ ### B. Luminous Intensity ($I_V$) The brightness is measured in millicandela (mcd). At 20mA, it provides a clear, visible red light. The intensity is directly proportional to the forward current; however, exceeding 30mA (Absolute Maximum) will significantly shorten the component's lifespan. ### C. Package Dimensions (1206) * **Metric Size:** 3216 * **Dimensions:** 3.2mm x 1.6mm x 1.1mm * **Mounting:** Surface Mount (SMT) compatible with automatic placement equipment. --- ## 3. Absolute Maximum Ratings Exceeding these values may cause permanent damage to the part: * **Power Dissipation ($P_D$):** 75 mW * **Peak Forward Current:** 125 mA (Duty 1/10 @ 1kHz) * **Operating Temperature:** -40°C to +85°C * **Storage Temperature:** -40°C to +100°C --- ## 4. Typical Applications The QBLP650-R is commonly found in: 1. **Industrial Equipment:** Power-on indicators and fault status lights. 2. **Consumer Electronics:** Backlighting for buttons and LCD displays. 3. **Automotive:** Interior dashboard lighting and indicator symbols.